Hi can someone help me out , i wanna know how can my app use firebase.google and send an sms to user when he tries to verify his phone number on the app. Thank you very much to anyone who could help me out.
Here is one way
is there a way where it is possible not to have an html file and no recaptcha? and is it possible to use just web and not webviewer
Possibly, but "I do not know the way" 
Probably requires some java code and an extension.